Fire-alarm system.



G. GR'ovEs.

FIRE ALARM SYSTEM.

APPLICATION FILED AUG.3I, I9I5. y l

- Patented May 30, 1916.l

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GIBsoNjGRovEs, 0F PARRY scum), curan-Io, CANADA. i .5 'l

.- FIRE-ALARM SYSTEM.

Application filed August 31, 1915. -f seriaiNoAsmg To all whom t may concern Be it known that I, GIBSON Gnovns,

Parry Sound, Provinceof Ontario, Canada,

a subject of the King of Great Britain, have invented certain new and useful 1mprovements in Fire-Alarm Systems, of' which the y mans residencey or elsewhere outside the following is a specification. p

This invention relates to fire Yalarmsystems particularly adapted for ysmall-placeswhere it is necessary to summon members of the brigade from their residences in case of fire, and my object is to devise a lsystem in which the sounding of an alarm'fromany particular boX gives .an alarm at the fire hall and also at the nearest -iiremans residence,

said system beingadapted to be conditioned to then enablev an alarm 'to be sent through all the circuits to all firemen neededfto" answer the call.

A further object is to arrange the system so that any circuit which may accidentally become broken may be cut out and so that the system may be tested at any time without sounding an alarm.

I attain my objects by means of the constructions hereinafter described and illustrated in th accompanying drawings in which- Figure 1 is a diagrammatical view of the system `with the selector switch in its normal position; and Fig. 2 a diagrammatical view of the selector switch in the position it assumes when an alarm is being sent out from the central station to the firemens residences.

In the drawings like numerals of reference indicate corresponding parts in the diiierent' ligures.

Referring to Fig. 1, it will be seen that a plurality of alarm circuits 1 are provided. Each circuit includes a magneto 2 suitably located for the sending in of an alarm and usually also a bell or other alarm device 3 located in a firemans residence or other suitable location. Each circuit also includes an indicator 4L preferably of the usual drop type and located at a central station.

Each circuit 1 has its ends connected at the central station with pairs of contacts 5 6 on a selector switch 7. This selector switch is provided with the rotary member 8 which is adapted to complete a circuit between each pair of contacts 5 6 as shown in Fig. 1.

fue townV of Parry Sound, inthe district of isa hand lever, by megvmsfof` Whchthe' switch may be operated. f v i c .f `It will beissen vtha-t normally each alarmli'v circuitfl is closed sovthat on the ringing of ,an alarm by the o'perationofl the magneto in anyA circuit the indicatorm that vcircuitls 1 operatedand also the alarm device in a lire# central station. l 1 v Inrorder thatl thealarm devices in Aall the circuits may be Vsimultaneously operated without affecting the indicators at 'the cenftral station, thefollowing arrangement is provided: Between each pair of contactsk 5 6 is located contact 10 with which is connected a -wire 411, so connectedwith thekv circuit las to form `agout-out forthe indi-y cater' therein.'v "lVhenthe selector switcl'rlisy movedito the position shown in Fig. 2, the circuits l are still closed, but the indicators are cut out. To one ofthe contacts 5 and to a contact 10 separated from the contact 5 by one of the contacts 6 is connected the circuit 12 in which is located the magneto 13. When the selector switch is in the position shown in Fig. 2, by actuating the magneto the alarm devices in all the circuits may be simultaneously operated, and by arranging a code of signals each alarm device may be caused to indicate the location of the fire. Simultaneously with the actuation of the indicator it is desirable to sound an audible alarm at the central station. For this purpose the circuit 14 is provided at the central station, which includes the bell 15. This circuit 14 is provided ateach indicator with a contact 16 at which the circuit is closed on the drop of the indicator. Such devices are well known in the art and require no detailed description. Y

As the alarm circuits are all in series when the selector switch is in its secondposition a break in any one circuit will prevent the sending of signals to the rest. Such a break, however, is easily discovered by successively bridging the contacts on the selector switch. As soon as the contacts of the broken circuit are bridged the `operation of the magneto sounds the alarm and the broken circuit can be left cut out until repairs can be effected. As the bells are responsive to the alternating current generated by the mag'- neto, any circuit can be tested by direct current at any time without an alarm being sounded.

From the above description it will be seen that I have devised a tire alarm system which will satisfactorily attain the objects of my invention as set out in the preamble to this speciication.

What I claim as my invention is :f-

1. In a tire alarm system, the combination of a plurality of alarm circuits each including a magneto, an electro-magnetic alarm device at an out station and an electro-magnetic indicator at a central station a selector switch provided with pairs of contacts to which said circuits are connected; a branch in each circuit whereby the indicator in each circuit may be cut out; a contact on the selector,

switch between each pair of contacts to which said branches are connected; a rotary switch member adapted to connect either the contacts of each pair or one of each pair and the adjacent branch contact; a magneto;

' andV contacts on the selector switch whereby the magneto is put in circuit with the alarm circuits and the alarm circuits in series when the switch is moved to cut out the indicators.

2. In a ire alarm system, the combination of a plurality of alarm circuits each including a magneto, an electro-magnetic alarm de vice at an out station and an electro-magnetic indicator at a central station; a selector switch provided with pairs of contacts to which said circuits are connected; a branch in each circuit whereby the indicator in each circuit may be cutout; a contact on the selector switch between each pair of contacts to which said branches are connected; a rotary switch member adapted to connect either the contacts of each pair or one of each pair and the adjacent branch contact; a magneto; contacts on the selector switch whereby the magneto is put in circuit with the alarm circuits and the alarm circuits in series when the switch is moved to cut out the indicators; and an extension bell circuit adapted to be closed by any one indicator.

Signed at Parry Sound, this 29th day of July; 1915, in the presence of the two undersigned witnesses. Y

1 GIBSON GROVES.

Vitnesses LESLIE LAWRENCE, Trios. J. BADGER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of iauemsy Washington, D. C. 

